kern_time.c revision 1.179.10.3
1 /* $NetBSD: kern_time.c,v 1.179.10.3 2016/03/19 11:30:31 skrll Exp $ */ 2 3 /*- 4 * Copyright (c) 2000, 2004, 2005, 2007, 2008, 2009 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Christopher G. Demetriou, and by Andrew Doran. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 /* 33 * Copyright (c) 1982, 1986, 1989, 1993 34 * The Regents of the University of California. All rights reserved. 35 * 36 * Redistribution and use in source and binary forms, with or without 37 * modification, are permitted provided that the following conditions 38 * are met: 39 * 1. Redistributions of source code must retain the above copyright 40 * notice, this list of conditions and the following disclaimer. 41 * 2. Redistributions in binary form must reproduce the above copyright 42 * notice, this list of conditions and the following disclaimer in the 43 * documentation and/or other materials provided with the distribution. 44 * 3. Neither the name of the University nor the names of its contributors 45 * may be used to endorse or promote products derived from this software 46 * without specific prior written permission. 47 * 48 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 49 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 51 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 52 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 53 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 54 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 56 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 57 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 58 * SUCH DAMAGE. 59 * 60 * @(#)kern_time.c 8.4 (Berkeley) 5/26/95 61 */ 62 63 #include <sys/cdefs.h> 64 __KERNEL_RCSID(0, "$NetBSD: kern_time.c,v 1.179.10.3 2016/03/19 11:30:31 skrll Exp $"); 65 66 #include <sys/param.h> 67 #include <sys/resourcevar.h> 68 #include <sys/kernel.h> 69 #include <sys/systm.h> 70 #include <sys/proc.h> 71 #include <sys/vnode.h> 72 #include <sys/signalvar.h> 73 #include <sys/syslog.h> 74 #include <sys/timetc.h> 75 #include <sys/timex.h> 76 #include <sys/kauth.h> 77 #include <sys/mount.h> 78 #include <sys/syscallargs.h> 79 #include <sys/cpu.h> 80 81 static void timer_intr(void *); 82 static void itimerfire(struct ptimer *); 83 static void itimerfree(struct ptimers *, int); 84 85 kmutex_t timer_lock; 86 87 static void *timer_sih; 88 static TAILQ_HEAD(, ptimer) timer_queue; 89 90 struct pool ptimer_pool, ptimers_pool; 91 92 #define CLOCK_VIRTUAL_P(clockid) \ 93 ((clockid) == CLOCK_VIRTUAL || (clockid) == CLOCK_PROF) 94 95 CTASSERT(ITIMER_REAL == CLOCK_REALTIME); 96 CTASSERT(ITIMER_VIRTUAL == CLOCK_VIRTUAL); 97 CTASSERT(ITIMER_PROF == CLOCK_PROF); 98 CTASSERT(ITIMER_MONOTONIC == CLOCK_MONOTONIC); 99 100 /* 101 * Initialize timekeeping. 102 */ 103 void 104 time_init(void) 105 { 106 107 pool_init(&ptimer_pool, sizeof(struct ptimer), 0, 0, 0, "ptimerpl", 108 &pool_allocator_nointr, IPL_NONE); 109 pool_init(&ptimers_pool, sizeof(struct ptimers), 0, 0, 0, "ptimerspl", 110 &pool_allocator_nointr, IPL_NONE); 111 } 112 113 void 114 time_init2(void) 115 { 116 117 TAILQ_INIT(&timer_queue); 118 mutex_init(&timer_lock, MUTEX_DEFAULT, IPL_SCHED); 119 timer_sih = softint_establish(SOFTINT_CLOCK | SOFTINT_MPSAFE, 120 timer_intr, NULL); 121 } 122 123 /* Time of day and interval timer support. 124 * 125 * These routines provide the kernel entry points to get and set 126 * the time-of-day and per-process interval timers. Subroutines 127 * here provide support for adding and subtracting timeval structures 128 * and decrementing interval timers, optionally reloading the interval 129 * timers when they expire. 130 */ 131 132 /* This function is used by clock_settime and settimeofday */ 133 static int 134 settime1(struct proc *p, const struct timespec *ts, bool check_kauth) 135 { 136 struct timespec delta, now; 137 int s; 138 139 /* WHAT DO WE DO ABOUT PENDING REAL-TIME TIMEOUTS??? */ 140 s = splclock(); 141 nanotime(&now); 142 timespecsub(ts, &now, &delta); 143 144 if (check_kauth && kauth_authorize_system(kauth_cred_get(), 145 KAUTH_SYSTEM_TIME, KAUTH_REQ_SYSTEM_TIME_SYSTEM, __UNCONST(ts), 146 &delta, KAUTH_ARG(check_kauth ? false : true)) != 0) { 147 splx(s); 148 return (EPERM); 149 } 150 151 #ifdef notyet 152 if ((delta.tv_sec < 86400) && securelevel > 0) { /* XXX elad - notyet */ 153 splx(s); 154 return (EPERM); 155 } 156 #endif 157 158 tc_setclock(ts); 159 160 timespecadd(&boottime, &delta, &boottime); 161 162 resettodr(); 163 splx(s); 164 165 return (0); 166 } 167 168 int 169 settime(struct proc *p, struct timespec *ts) 170 { 171 return (settime1(p, ts, true)); 172 } 173 174 /* ARGSUSED */ 175 int 176 sys___clock_gettime50(struct lwp *l, 177 const struct sys___clock_gettime50_args *uap, register_t *retval) 178 { 179 /* { 180 syscallarg(clockid_t) clock_id; 181 syscallarg(struct timespec *) tp; 182 } */ 183 int error; 184 struct timespec ats; 185 186 error = clock_gettime1(SCARG(uap, clock_id), &ats); 187 if (error != 0) 188 return error; 189 190 return copyout(&ats, SCARG(uap, tp), sizeof(ats)); 191 } 192 193 /* ARGSUSED */ 194 int 195 sys___clock_settime50(struct lwp *l, 196 const struct sys___clock_settime50_args *uap, register_t *retval) 197 { 198 /* { 199 syscallarg(clockid_t) clock_id; 200 syscallarg(const struct timespec *) tp; 201 } */ 202 int error; 203 struct timespec ats; 204 205 if ((error = copyin(SCARG(uap, tp), &ats, sizeof(ats))) != 0) 206 return error; 207 208 return clock_settime1(l->l_proc, SCARG(uap, clock_id), &ats, true); 209 } 210 211 212 int 213 clock_settime1(struct proc *p, clockid_t clock_id, const struct timespec *tp, 214 bool check_kauth) 215 { 216 int error; 217 218 switch (clock_id) { 219 case CLOCK_REALTIME: 220 if ((error = settime1(p, tp, check_kauth)) != 0) 221 return (error); 222 break; 223 case CLOCK_MONOTONIC: 224 return (EINVAL); /* read-only clock */ 225 default: 226 return (EINVAL); 227 } 228 229 return 0; 230 } 231 232 int 233 sys___clock_getres50(struct lwp *l, const struct sys___clock_getres50_args *uap, 234 register_t *retval) 235 { 236 /* { 237 syscallarg(clockid_t) clock_id; 238 syscallarg(struct timespec *) tp; 239 } */ 240 struct timespec ts; 241 int error; 242 243 if ((error = clock_getres1(SCARG(uap, clock_id), &ts)) != 0) 244 return error; 245 246 if (SCARG(uap, tp)) 247 error = copyout(&ts, SCARG(uap, tp), sizeof(ts)); 248 249 return error; 250 } 251 252 int 253 clock_getres1(clockid_t clock_id, struct timespec *ts) 254 { 255 256 switch (clock_id) { 257 case CLOCK_REALTIME: 258 case CLOCK_MONOTONIC: 259 ts->tv_sec = 0; 260 if (tc_getfrequency() > 1000000000) 261 ts->tv_nsec = 1; 262 else 263 ts->tv_nsec = 1000000000 / tc_getfrequency(); 264 break; 265 default: 266 return EINVAL; 267 } 268 269 return 0; 270 } 271 272 /* ARGSUSED */ 273 int 274 sys___nanosleep50(struct lwp *l, const struct sys___nanosleep50_args *uap, 275 register_t *retval) 276 { 277 /* { 278 syscallarg(struct timespec *) rqtp; 279 syscallarg(struct timespec *) rmtp; 280 } */ 281 struct timespec rmt, rqt; 282 int error, error1; 283 284 error = copyin(SCARG(uap, rqtp), &rqt, sizeof(struct timespec)); 285 if (error) 286 return (error); 287 288 error = nanosleep1(l, CLOCK_MONOTONIC, 0, &rqt, 289 SCARG(uap, rmtp) ? &rmt : NULL); 290 if (SCARG(uap, rmtp) == NULL || (error != 0 && error != EINTR)) 291 return error; 292 293 error1 = copyout(&rmt, SCARG(uap, rmtp), sizeof(rmt)); 294 return error1 ? error1 : error; 295 } 296 297 /* ARGSUSED */ 298 int 299 sys_clock_nanosleep(struct lwp *l, const struct sys_clock_nanosleep_args *uap, 300 register_t *retval) 301 { 302 /* { 303 syscallarg(clockid_t) clock_id; 304 syscallarg(int) flags; 305 syscallarg(struct timespec *) rqtp; 306 syscallarg(struct timespec *) rmtp; 307 } */ 308 struct timespec rmt, rqt; 309 int error, error1; 310 311 error = copyin(SCARG(uap, rqtp), &rqt, sizeof(struct timespec)); 312 if (error) 313 goto out; 314 315 error = nanosleep1(l, SCARG(uap, clock_id), SCARG(uap, flags), &rqt, 316 SCARG(uap, rmtp) ? &rmt : NULL); 317 if (SCARG(uap, rmtp) == NULL || (error != 0 && error != EINTR)) 318 goto out; 319 320 if ((error1 = copyout(&rmt, SCARG(uap, rmtp), sizeof(rmt))) != 0) 321 error = error1; 322 out: 323 *retval = error; 324 return 0; 325 } 326 327 int 328 nanosleep1(struct lwp *l, clockid_t clock_id, int flags, struct timespec *rqt, 329 struct timespec *rmt) 330 { 331 struct timespec rmtstart; 332 int error, timo; 333 334 if ((error = ts2timo(clock_id, flags, rqt, &timo, &rmtstart)) != 0) { 335 if (error == ETIMEDOUT) { 336 error = 0; 337 if (rmt != NULL) 338 rmt->tv_sec = rmt->tv_nsec = 0; 339 } 340 return error; 341 } 342 343 /* 344 * Avoid inadvertently sleeping forever 345 */ 346 if (timo == 0) 347 timo = 1; 348 again: 349 error = kpause("nanoslp", true, timo, NULL); 350 if (rmt != NULL || error == 0) { 351 struct timespec rmtend; 352 struct timespec t0; 353 struct timespec *t; 354 355 (void)clock_gettime1(clock_id, &rmtend); 356 t = (rmt != NULL) ? rmt : &t0; 357 if (flags & TIMER_ABSTIME) { 358 timespecsub(rqt, &rmtend, t); 359 } else { 360 timespecsub(&rmtend, &rmtstart, t); 361 timespecsub(rqt, t, t); 362 } 363 if (t->tv_sec < 0) 364 timespecclear(t); 365 if (error == 0) { 366 timo = tstohz(t); 367 if (timo > 0) 368 goto again; 369 } 370 } 371 372 if (error == ERESTART) 373 error = EINTR; 374 if (error == EWOULDBLOCK) 375 error = 0; 376 377 return error; 378 } 379 380 /* ARGSUSED */ 381 int 382 sys___gettimeofday50(struct lwp *l, const struct sys___gettimeofday50_args *uap, 383 register_t *retval) 384 { 385 /* { 386 syscallarg(struct timeval *) tp; 387 syscallarg(void *) tzp; really "struct timezone *"; 388 } */ 389 struct timeval atv; 390 int error = 0; 391 struct timezone tzfake; 392 393 if (SCARG(uap, tp)) { 394 microtime(&atv); 395 error = copyout(&atv, SCARG(uap, tp), sizeof(atv)); 396 if (error) 397 return (error); 398 } 399 if (SCARG(uap, tzp)) { 400 /* 401 * NetBSD has no kernel notion of time zone, so we just 402 * fake up a timezone struct and return it if demanded. 403 */ 404 tzfake.tz_minuteswest = 0; 405 tzfake.tz_dsttime = 0; 406 error = copyout(&tzfake, SCARG(uap, tzp), sizeof(tzfake)); 407 } 408 return (error); 409 } 410 411 /* ARGSUSED */ 412 int 413 sys___settimeofday50(struct lwp *l, const struct sys___settimeofday50_args *uap, 414 register_t *retval) 415 { 416 /* { 417 syscallarg(const struct timeval *) tv; 418 syscallarg(const void *) tzp; really "const struct timezone *"; 419 } */ 420 421 return settimeofday1(SCARG(uap, tv), true, SCARG(uap, tzp), l, true); 422 } 423 424 int 425 settimeofday1(const struct timeval *utv, bool userspace, 426 const void *utzp, struct lwp *l, bool check_kauth) 427 { 428 struct timeval atv; 429 struct timespec ts; 430 int error; 431 432 /* Verify all parameters before changing time. */ 433 434 /* 435 * NetBSD has no kernel notion of time zone, and only an 436 * obsolete program would try to set it, so we log a warning. 437 */ 438 if (utzp) 439 log(LOG_WARNING, "pid %d attempted to set the " 440 "(obsolete) kernel time zone\n", l->l_proc->p_pid); 441 442 if (utv == NULL) 443 return 0; 444 445 if (userspace) { 446 if ((error = copyin(utv, &atv, sizeof(atv))) != 0) 447 return error; 448 utv = &atv; 449 } 450 451 TIMEVAL_TO_TIMESPEC(utv, &ts); 452 return settime1(l->l_proc, &ts, check_kauth); 453 } 454 455 int time_adjusted; /* set if an adjustment is made */ 456 457 /* ARGSUSED */ 458 int 459 sys___adjtime50(struct lwp *l, const struct sys___adjtime50_args *uap, 460 register_t *retval) 461 { 462 /* { 463 syscallarg(const struct timeval *) delta; 464 syscallarg(struct timeval *) olddelta; 465 } */ 466 int error; 467 struct timeval atv, oldatv; 468 469 if ((error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_TIME, 470 KAUTH_REQ_SYSTEM_TIME_ADJTIME, NULL, NULL, NULL)) != 0) 471 return error; 472 473 if (SCARG(uap, delta)) { 474 error = copyin(SCARG(uap, delta), &atv, 475 sizeof(*SCARG(uap, delta))); 476 if (error) 477 return (error); 478 } 479 adjtime1(SCARG(uap, delta) ? &atv : NULL, 480 SCARG(uap, olddelta) ? &oldatv : NULL, l->l_proc); 481 if (SCARG(uap, olddelta)) 482 error = copyout(&oldatv, SCARG(uap, olddelta), 483 sizeof(*SCARG(uap, olddelta))); 484 return error; 485 } 486 487 void 488 adjtime1(const struct timeval *delta, struct timeval *olddelta, struct proc *p) 489 { 490 extern int64_t time_adjtime; /* in kern_ntptime.c */ 491 492 if (olddelta) { 493 mutex_spin_enter(&timecounter_lock); 494 olddelta->tv_sec = time_adjtime / 1000000; 495 olddelta->tv_usec = time_adjtime % 1000000; 496 if (olddelta->tv_usec < 0) { 497 olddelta->tv_usec += 1000000; 498 olddelta->tv_sec--; 499 } 500 mutex_spin_exit(&timecounter_lock); 501 } 502 503 if (delta) { 504 mutex_spin_enter(&timecounter_lock); 505 time_adjtime = delta->tv_sec * 1000000 + delta->tv_usec; 506 507 if (time_adjtime) { 508 /* We need to save the system time during shutdown */ 509 time_adjusted |= 1; 510 } 511 mutex_spin_exit(&timecounter_lock); 512 } 513 } 514 515 /* 516 * Interval timer support. Both the BSD getitimer() family and the POSIX 517 * timer_*() family of routines are supported. 518 * 519 * All timers are kept in an array pointed to by p_timers, which is 520 * allocated on demand - many processes don't use timers at all. The 521 * first four elements in this array are reserved for the BSD timers: 522 * element 0 is ITIMER_REAL, element 1 is ITIMER_VIRTUAL, element 523 * 2 is ITIMER_PROF, and element 3 is ITIMER_MONOTONIC. The rest may be 524 * allocated by the timer_create() syscall. 525 * 526 * Realtime timers are kept in the ptimer structure as an absolute 527 * time; virtual time timers are kept as a linked list of deltas. 528 * Virtual time timers are processed in the hardclock() routine of 529 * kern_clock.c. The real time timer is processed by a callout 530 * routine, called from the softclock() routine. Since a callout may 531 * be delayed in real time due to interrupt processing in the system, 532 * it is possible for the real time timeout routine (realtimeexpire, 533 * given below), to be delayed in real time past when it is supposed 534 * to occur. It does not suffice, therefore, to reload the real timer 535 * .it_value from the real time timers .it_interval. Rather, we 536 * compute the next time in absolute time the timer should go off. */ 537 538 /* Allocate a POSIX realtime timer. */ 539 int 540 sys_timer_create(struct lwp *l, const struct sys_timer_create_args *uap, 541 register_t *retval) 542 { 543 /* { 544 syscallarg(clockid_t) clock_id; 545 syscallarg(struct sigevent *) evp; 546 syscallarg(timer_t *) timerid; 547 } */ 548 549 return timer_create1(SCARG(uap, timerid), SCARG(uap, clock_id), 550 SCARG(uap, evp), copyin, l); 551 } 552 553 int 554 timer_create1(timer_t *tid, clockid_t id, struct sigevent *evp, 555 copyin_t fetch_event, struct lwp *l) 556 { 557 int error; 558 timer_t timerid; 559 struct ptimers *pts; 560 struct ptimer *pt; 561 struct proc *p; 562 563 p = l->l_proc; 564 565 if ((u_int)id > CLOCK_MONOTONIC) 566 return (EINVAL); 567 568 if ((pts = p->p_timers) == NULL) 569 pts = timers_alloc(p); 570 571 pt = pool_get(&ptimer_pool, PR_WAITOK); 572 if (evp != NULL) { 573 if (((error = 574 (*fetch_event)(evp, &pt->pt_ev, sizeof(pt->pt_ev))) != 0) || 575 ((pt->pt_ev.sigev_notify < SIGEV_NONE) || 576 (pt->pt_ev.sigev_notify > SIGEV_SA)) || 577 (pt->pt_ev.sigev_notify == SIGEV_SIGNAL && 578 (pt->pt_ev.sigev_signo <= 0 || 579 pt->pt_ev.sigev_signo >= NSIG))) { 580 pool_put(&ptimer_pool, pt); 581 return (error ? error : EINVAL); 582 } 583 } 584 585 /* Find a free timer slot, skipping those reserved for setitimer(). */ 586 mutex_spin_enter(&timer_lock); 587 for (timerid = TIMER_MIN; timerid < TIMER_MAX; timerid++) 588 if (pts->pts_timers[timerid] == NULL) 589 break; 590 if (timerid == TIMER_MAX) { 591 mutex_spin_exit(&timer_lock); 592 pool_put(&ptimer_pool, pt); 593 return EAGAIN; 594 } 595 if (evp == NULL) { 596 pt->pt_ev.sigev_notify = SIGEV_SIGNAL; 597 switch (id) { 598 case CLOCK_REALTIME: 599 case CLOCK_MONOTONIC: 600 pt->pt_ev.sigev_signo = SIGALRM; 601 break; 602 case CLOCK_VIRTUAL: 603 pt->pt_ev.sigev_signo = SIGVTALRM; 604 break; 605 case CLOCK_PROF: 606 pt->pt_ev.sigev_signo = SIGPROF; 607 break; 608 } 609 pt->pt_ev.sigev_value.sival_int = timerid; 610 } 611 pt->pt_info.ksi_signo = pt->pt_ev.sigev_signo; 612 pt->pt_info.ksi_errno = 0; 613 pt->pt_info.ksi_code = 0; 614 pt->pt_info.ksi_pid = p->p_pid; 615 pt->pt_info.ksi_uid = kauth_cred_getuid(l->l_cred); 616 pt->pt_info.ksi_value = pt->pt_ev.sigev_value; 617 pt->pt_type = id; 618 pt->pt_proc = p; 619 pt->pt_overruns = 0; 620 pt->pt_poverruns = 0; 621 pt->pt_entry = timerid; 622 pt->pt_queued = false; 623 timespecclear(&pt->pt_time.it_value); 624 if (!CLOCK_VIRTUAL_P(id)) 625 callout_init(&pt->pt_ch, CALLOUT_MPSAFE); 626 else 627 pt->pt_active = 0; 628 629 pts->pts_timers[timerid] = pt; 630 mutex_spin_exit(&timer_lock); 631 632 return copyout(&timerid, tid, sizeof(timerid)); 633 } 634 635 /* Delete a POSIX realtime timer */ 636 int 637 sys_timer_delete(struct lwp *l, const struct sys_timer_delete_args *uap, 638 register_t *retval) 639 { 640 /* { 641 syscallarg(timer_t) timerid; 642 } */ 643 struct proc *p = l->l_proc; 644 timer_t timerid; 645 struct ptimers *pts; 646 struct ptimer *pt, *ptn; 647 648 timerid = SCARG(uap, timerid); 649 pts = p->p_timers; 650 651 if (pts == NULL || timerid < 2 || timerid >= TIMER_MAX) 652 return (EINVAL); 653 654 mutex_spin_enter(&timer_lock); 655 if ((pt = pts->pts_timers[timerid]) == NULL) { 656 mutex_spin_exit(&timer_lock); 657 return (EINVAL); 658 } 659 if (CLOCK_VIRTUAL_P(pt->pt_type)) { 660 if (pt->pt_active) { 661 ptn = LIST_NEXT(pt, pt_list); 662 LIST_REMOVE(pt, pt_list); 663 for ( ; ptn; ptn = LIST_NEXT(ptn, pt_list)) 664 timespecadd(&pt->pt_time.it_value, 665 &ptn->pt_time.it_value, 666 &ptn->pt_time.it_value); 667 pt->pt_active = 0; 668 } 669 } 670 itimerfree(pts, timerid); 671 672 return (0); 673 } 674 675 /* 676 * Set up the given timer. The value in pt->pt_time.it_value is taken 677 * to be an absolute time for CLOCK_REALTIME/CLOCK_MONOTONIC timers and 678 * a relative time for CLOCK_VIRTUAL/CLOCK_PROF timers. 679 */ 680 void 681 timer_settime(struct ptimer *pt) 682 { 683 struct ptimer *ptn, *pptn; 684 struct ptlist *ptl; 685 686 KASSERT(mutex_owned(&timer_lock)); 687 688 if (!CLOCK_VIRTUAL_P(pt->pt_type)) { 689 callout_halt(&pt->pt_ch, &timer_lock); 690 if (timespecisset(&pt->pt_time.it_value)) { 691 /* 692 * Don't need to check tshzto() return value, here. 693 * callout_reset() does it for us. 694 */ 695 callout_reset(&pt->pt_ch, 696 pt->pt_type == CLOCK_MONOTONIC ? 697 tshztoup(&pt->pt_time.it_value) : 698 tshzto(&pt->pt_time.it_value), 699 realtimerexpire, pt); 700 } 701 } else { 702 if (pt->pt_active) { 703 ptn = LIST_NEXT(pt, pt_list); 704 LIST_REMOVE(pt, pt_list); 705 for ( ; ptn; ptn = LIST_NEXT(ptn, pt_list)) 706 timespecadd(&pt->pt_time.it_value, 707 &ptn->pt_time.it_value, 708 &ptn->pt_time.it_value); 709 } 710 if (timespecisset(&pt->pt_time.it_value)) { 711 if (pt->pt_type == CLOCK_VIRTUAL) 712 ptl = &pt->pt_proc->p_timers->pts_virtual; 713 else 714 ptl = &pt->pt_proc->p_timers->pts_prof; 715 716 for (ptn = LIST_FIRST(ptl), pptn = NULL; 717 ptn && timespeccmp(&pt->pt_time.it_value, 718 &ptn->pt_time.it_value, >); 719 pptn = ptn, ptn = LIST_NEXT(ptn, pt_list)) 720 timespecsub(&pt->pt_time.it_value, 721 &ptn->pt_time.it_value, 722 &pt->pt_time.it_value); 723 724 if (pptn) 725 LIST_INSERT_AFTER(pptn, pt, pt_list); 726 else 727 LIST_INSERT_HEAD(ptl, pt, pt_list); 728 729 for ( ; ptn ; ptn = LIST_NEXT(ptn, pt_list)) 730 timespecsub(&ptn->pt_time.it_value, 731 &pt->pt_time.it_value, 732 &ptn->pt_time.it_value); 733 734 pt->pt_active = 1; 735 } else 736 pt->pt_active = 0; 737 } 738 } 739 740 void 741 timer_gettime(struct ptimer *pt, struct itimerspec *aits) 742 { 743 struct timespec now; 744 struct ptimer *ptn; 745 746 KASSERT(mutex_owned(&timer_lock)); 747 748 *aits = pt->pt_time; 749 if (!CLOCK_VIRTUAL_P(pt->pt_type)) { 750 /* 751 * Convert from absolute to relative time in .it_value 752 * part of real time timer. If time for real time 753 * timer has passed return 0, else return difference 754 * between current time and time for the timer to go 755 * off. 756 */ 757 if (timespecisset(&aits->it_value)) { 758 if (pt->pt_type == CLOCK_REALTIME) { 759 getnanotime(&now); 760 } else { /* CLOCK_MONOTONIC */ 761 getnanouptime(&now); 762 } 763 if (timespeccmp(&aits->it_value, &now, <)) 764 timespecclear(&aits->it_value); 765 else 766 timespecsub(&aits->it_value, &now, 767 &aits->it_value); 768 } 769 } else if (pt->pt_active) { 770 if (pt->pt_type == CLOCK_VIRTUAL) 771 ptn = LIST_FIRST(&pt->pt_proc->p_timers->pts_virtual); 772 else 773 ptn = LIST_FIRST(&pt->pt_proc->p_timers->pts_prof); 774 for ( ; ptn && ptn != pt; ptn = LIST_NEXT(ptn, pt_list)) 775 timespecadd(&aits->it_value, 776 &ptn->pt_time.it_value, &aits->it_value); 777 KASSERT(ptn != NULL); /* pt should be findable on the list */ 778 } else 779 timespecclear(&aits->it_value); 780 } 781 782 783 784 /* Set and arm a POSIX realtime timer */ 785 int 786 sys___timer_settime50(struct lwp *l, 787 const struct sys___timer_settime50_args *uap, 788 register_t *retval) 789 { 790 /* { 791 syscallarg(timer_t) timerid; 792 syscallarg(int) flags; 793 syscallarg(const struct itimerspec *) value; 794 syscallarg(struct itimerspec *) ovalue; 795 } */ 796 int error; 797 struct itimerspec value, ovalue, *ovp = NULL; 798 799 if ((error = copyin(SCARG(uap, value), &value, 800 sizeof(struct itimerspec))) != 0) 801 return (error); 802 803 if (SCARG(uap, ovalue)) 804 ovp = &ovalue; 805 806 if ((error = dotimer_settime(SCARG(uap, timerid), &value, ovp, 807 SCARG(uap, flags), l->l_proc)) != 0) 808 return error; 809 810 if (ovp) 811 return copyout(&ovalue, SCARG(uap, ovalue), 812 sizeof(struct itimerspec)); 813 return 0; 814 } 815 816 int 817 dotimer_settime(int timerid, struct itimerspec *value, 818 struct itimerspec *ovalue, int flags, struct proc *p) 819 { 820 struct timespec now; 821 struct itimerspec val, oval; 822 struct ptimers *pts; 823 struct ptimer *pt; 824 int error; 825 826 pts = p->p_timers; 827 828 if (pts == NULL || timerid < 2 || timerid >= TIMER_MAX) 829 return EINVAL; 830 val = *value; 831 if ((error = itimespecfix(&val.it_value)) != 0 || 832 (error = itimespecfix(&val.it_interval)) != 0) 833 return error; 834 835 mutex_spin_enter(&timer_lock); 836 if ((pt = pts->pts_timers[timerid]) == NULL) { 837 mutex_spin_exit(&timer_lock); 838 return EINVAL; 839 } 840 841 oval = pt->pt_time; 842 pt->pt_time = val; 843 844 /* 845 * If we've been passed a relative time for a realtime timer, 846 * convert it to absolute; if an absolute time for a virtual 847 * timer, convert it to relative and make sure we don't set it 848 * to zero, which would cancel the timer, or let it go 849 * negative, which would confuse the comparison tests. 850 */ 851 if (timespecisset(&pt->pt_time.it_value)) { 852 if (!CLOCK_VIRTUAL_P(pt->pt_type)) { 853 if ((flags & TIMER_ABSTIME) == 0) { 854 if (pt->pt_type == CLOCK_REALTIME) { 855 getnanotime(&now); 856 } else { /* CLOCK_MONOTONIC */ 857 getnanouptime(&now); 858 } 859 timespecadd(&pt->pt_time.it_value, &now, 860 &pt->pt_time.it_value); 861 } 862 } else { 863 if ((flags & TIMER_ABSTIME) != 0) { 864 getnanotime(&now); 865 timespecsub(&pt->pt_time.it_value, &now, 866 &pt->pt_time.it_value); 867 if (!timespecisset(&pt->pt_time.it_value) || 868 pt->pt_time.it_value.tv_sec < 0) { 869 pt->pt_time.it_value.tv_sec = 0; 870 pt->pt_time.it_value.tv_nsec = 1; 871 } 872 } 873 } 874 } 875 876 timer_settime(pt); 877 mutex_spin_exit(&timer_lock); 878 879 if (ovalue) 880 *ovalue = oval; 881 882 return (0); 883 } 884 885 /* Return the time remaining until a POSIX timer fires. */ 886 int 887 sys___timer_gettime50(struct lwp *l, 888 const struct sys___timer_gettime50_args *uap, register_t *retval) 889 { 890 /* { 891 syscallarg(timer_t) timerid; 892 syscallarg(struct itimerspec *) value; 893 } */ 894 struct itimerspec its; 895 int error; 896 897 if ((error = dotimer_gettime(SCARG(uap, timerid), l->l_proc, 898 &its)) != 0) 899 return error; 900 901 return copyout(&its, SCARG(uap, value), sizeof(its)); 902 } 903 904 int 905 dotimer_gettime(int timerid, struct proc *p, struct itimerspec *its) 906 { 907 struct ptimer *pt; 908 struct ptimers *pts; 909 910 pts = p->p_timers; 911 if (pts == NULL || timerid < 2 || timerid >= TIMER_MAX) 912 return (EINVAL); 913 mutex_spin_enter(&timer_lock); 914 if ((pt = pts->pts_timers[timerid]) == NULL) { 915 mutex_spin_exit(&timer_lock); 916 return (EINVAL); 917 } 918 timer_gettime(pt, its); 919 mutex_spin_exit(&timer_lock); 920 921 return 0; 922 } 923 924 /* 925 * Return the count of the number of times a periodic timer expired 926 * while a notification was already pending. The counter is reset when 927 * a timer expires and a notification can be posted. 928 */ 929 int 930 sys_timer_getoverrun(struct lwp *l, const struct sys_timer_getoverrun_args *uap, 931 register_t *retval) 932 { 933 /* { 934 syscallarg(timer_t) timerid; 935 } */ 936 struct proc *p = l->l_proc; 937 struct ptimers *pts; 938 int timerid; 939 struct ptimer *pt; 940 941 timerid = SCARG(uap, timerid); 942 943 pts = p->p_timers; 944 if (pts == NULL || timerid < 2 || timerid >= TIMER_MAX) 945 return (EINVAL); 946 mutex_spin_enter(&timer_lock); 947 if ((pt = pts->pts_timers[timerid]) == NULL) { 948 mutex_spin_exit(&timer_lock); 949 return (EINVAL); 950 } 951 *retval = pt->pt_poverruns; 952 mutex_spin_exit(&timer_lock); 953 954 return (0); 955 } 956 957 /* 958 * Real interval timer expired: 959 * send process whose timer expired an alarm signal. 960 * If time is not set up to reload, then just return. 961 * Else compute next time timer should go off which is > current time. 962 * This is where delay in processing this timeout causes multiple 963 * SIGALRM calls to be compressed into one. 964 */ 965 void 966 realtimerexpire(void *arg) 967 { 968 uint64_t last_val, next_val, interval, now_ns; 969 struct timespec now, next; 970 struct ptimer *pt; 971 int backwards; 972 973 pt = arg; 974 975 mutex_spin_enter(&timer_lock); 976 itimerfire(pt); 977 978 if (!timespecisset(&pt->pt_time.it_interval)) { 979 timespecclear(&pt->pt_time.it_value); 980 mutex_spin_exit(&timer_lock); 981 return; 982 } 983 984 if (pt->pt_type == CLOCK_MONOTONIC) { 985 getnanouptime(&now); 986 } else { 987 getnanotime(&now); 988 } 989 backwards = (timespeccmp(&pt->pt_time.it_value, &now, >)); 990 timespecadd(&pt->pt_time.it_value, &pt->pt_time.it_interval, &next); 991 /* Handle the easy case of non-overflown timers first. */ 992 if (!backwards && timespeccmp(&next, &now, >)) { 993 pt->pt_time.it_value = next; 994 } else { 995 now_ns = timespec2ns(&now); 996 last_val = timespec2ns(&pt->pt_time.it_value); 997 interval = timespec2ns(&pt->pt_time.it_interval); 998 999 next_val = now_ns + 1000 (now_ns - last_val + interval - 1) % interval; 1001 1002 if (backwards) 1003 next_val += interval; 1004 else 1005 pt->pt_overruns += (now_ns - last_val) / interval; 1006 1007 pt->pt_time.it_value.tv_sec = next_val / 1000000000; 1008 pt->pt_time.it_value.tv_nsec = next_val % 1000000000; 1009 } 1010 1011 /* 1012 * Don't need to check tshzto() return value, here. 1013 * callout_reset() does it for us. 1014 */ 1015 callout_reset(&pt->pt_ch, pt->pt_type == CLOCK_MONOTONIC ? 1016 tshztoup(&pt->pt_time.it_value) : tshzto(&pt->pt_time.it_value), 1017 realtimerexpire, pt); 1018 mutex_spin_exit(&timer_lock); 1019 } 1020 1021 /* BSD routine to get the value of an interval timer. */ 1022 /* ARGSUSED */ 1023 int 1024 sys___getitimer50(struct lwp *l, const struct sys___getitimer50_args *uap, 1025 register_t *retval) 1026 { 1027 /* { 1028 syscallarg(int) which; 1029 syscallarg(struct itimerval *) itv; 1030 } */ 1031 struct proc *p = l->l_proc; 1032 struct itimerval aitv; 1033 int error; 1034 1035 error = dogetitimer(p, SCARG(uap, which), &aitv); 1036 if (error) 1037 return error; 1038 return (copyout(&aitv, SCARG(uap, itv), sizeof(struct itimerval))); 1039 } 1040 1041 int 1042 dogetitimer(struct proc *p, int which, struct itimerval *itvp) 1043 { 1044 struct ptimers *pts; 1045 struct ptimer *pt; 1046 struct itimerspec its; 1047 1048 if ((u_int)which > ITIMER_MONOTONIC) 1049 return (EINVAL); 1050 1051 mutex_spin_enter(&timer_lock); 1052 pts = p->p_timers; 1053 if (pts == NULL || (pt = pts->pts_timers[which]) == NULL) { 1054 timerclear(&itvp->it_value); 1055 timerclear(&itvp->it_interval); 1056 } else { 1057 timer_gettime(pt, &its); 1058 TIMESPEC_TO_TIMEVAL(&itvp->it_value, &its.it_value); 1059 TIMESPEC_TO_TIMEVAL(&itvp->it_interval, &its.it_interval); 1060 } 1061 mutex_spin_exit(&timer_lock); 1062 1063 return 0; 1064 } 1065 1066 /* BSD routine to set/arm an interval timer. */ 1067 /* ARGSUSED */ 1068 int 1069 sys___setitimer50(struct lwp *l, const struct sys___setitimer50_args *uap, 1070 register_t *retval) 1071 { 1072 /* { 1073 syscallarg(int) which; 1074 syscallarg(const struct itimerval *) itv; 1075 syscallarg(struct itimerval *) oitv; 1076 } */ 1077 struct proc *p = l->l_proc; 1078 int which = SCARG(uap, which); 1079 struct sys___getitimer50_args getargs; 1080 const struct itimerval *itvp; 1081 struct itimerval aitv; 1082 int error; 1083 1084 if ((u_int)which > ITIMER_MONOTONIC) 1085 return (EINVAL); 1086 itvp = SCARG(uap, itv); 1087 if (itvp && 1088 (error = copyin(itvp, &aitv, sizeof(struct itimerval))) != 0) 1089 return (error); 1090 if (SCARG(uap, oitv) != NULL) { 1091 SCARG(&getargs, which) = which; 1092 SCARG(&getargs, itv) = SCARG(uap, oitv); 1093 if ((error = sys___getitimer50(l, &getargs, retval)) != 0) 1094 return (error); 1095 } 1096 if (itvp == 0) 1097 return (0); 1098 1099 return dosetitimer(p, which, &aitv); 1100 } 1101 1102 int 1103 dosetitimer(struct proc *p, int which, struct itimerval *itvp) 1104 { 1105 struct timespec now; 1106 struct ptimers *pts; 1107 struct ptimer *pt, *spare; 1108 1109 KASSERT((u_int)which <= CLOCK_MONOTONIC); 1110 if (itimerfix(&itvp->it_value) || itimerfix(&itvp->it_interval)) 1111 return (EINVAL); 1112 1113 /* 1114 * Don't bother allocating data structures if the process just 1115 * wants to clear the timer. 1116 */ 1117 spare = NULL; 1118 pts = p->p_timers; 1119 retry: 1120 if (!timerisset(&itvp->it_value) && (pts == NULL || 1121 pts->pts_timers[which] == NULL)) 1122 return (0); 1123 if (pts == NULL) 1124 pts = timers_alloc(p); 1125 mutex_spin_enter(&timer_lock); 1126 pt = pts->pts_timers[which]; 1127 if (pt == NULL) { 1128 if (spare == NULL) { 1129 mutex_spin_exit(&timer_lock); 1130 spare = pool_get(&ptimer_pool, PR_WAITOK); 1131 goto retry; 1132 } 1133 pt = spare; 1134 spare = NULL; 1135 pt->pt_ev.sigev_notify = SIGEV_SIGNAL; 1136 pt->pt_ev.sigev_value.sival_int = which; 1137 pt->pt_overruns = 0; 1138 pt->pt_proc = p; 1139 pt->pt_type = which; 1140 pt->pt_entry = which; 1141 pt->pt_queued = false; 1142 if (pt->pt_type == CLOCK_REALTIME) 1143 callout_init(&pt->pt_ch, CALLOUT_MPSAFE); 1144 else 1145 pt->pt_active = 0; 1146 1147 switch (which) { 1148 case ITIMER_REAL: 1149 case ITIMER_MONOTONIC: 1150 pt->pt_ev.sigev_signo = SIGALRM; 1151 break; 1152 case ITIMER_VIRTUAL: 1153 pt->pt_ev.sigev_signo = SIGVTALRM; 1154 break; 1155 case ITIMER_PROF: 1156 pt->pt_ev.sigev_signo = SIGPROF; 1157 break; 1158 } 1159 pts->pts_timers[which] = pt; 1160 } 1161 1162 TIMEVAL_TO_TIMESPEC(&itvp->it_value, &pt->pt_time.it_value); 1163 TIMEVAL_TO_TIMESPEC(&itvp->it_interval, &pt->pt_time.it_interval); 1164 1165 if (timespecisset(&pt->pt_time.it_value)) { 1166 /* Convert to absolute time */ 1167 /* XXX need to wrap in splclock for timecounters case? */ 1168 switch (which) { 1169 case ITIMER_REAL: 1170 getnanotime(&now); 1171 timespecadd(&pt->pt_time.it_value, &now, 1172 &pt->pt_time.it_value); 1173 break; 1174 case ITIMER_MONOTONIC: 1175 getnanouptime(&now); 1176 timespecadd(&pt->pt_time.it_value, &now, 1177 &pt->pt_time.it_value); 1178 break; 1179 default: 1180 break; 1181 } 1182 } 1183 timer_settime(pt); 1184 mutex_spin_exit(&timer_lock); 1185 if (spare != NULL) 1186 pool_put(&ptimer_pool, spare); 1187 1188 return (0); 1189 } 1190 1191 /* Utility routines to manage the array of pointers to timers. */ 1192 struct ptimers * 1193 timers_alloc(struct proc *p) 1194 { 1195 struct ptimers *pts; 1196 int i; 1197 1198 pts = pool_get(&ptimers_pool, PR_WAITOK); 1199 LIST_INIT(&pts->pts_virtual); 1200 LIST_INIT(&pts->pts_prof); 1201 for (i = 0; i < TIMER_MAX; i++) 1202 pts->pts_timers[i] = NULL; 1203 mutex_spin_enter(&timer_lock); 1204 if (p->p_timers == NULL) { 1205 p->p_timers = pts; 1206 mutex_spin_exit(&timer_lock); 1207 return pts; 1208 } 1209 mutex_spin_exit(&timer_lock); 1210 pool_put(&ptimers_pool, pts); 1211 return p->p_timers; 1212 } 1213 1214 /* 1215 * Clean up the per-process timers. If "which" is set to TIMERS_ALL, 1216 * then clean up all timers and free all the data structures. If 1217 * "which" is set to TIMERS_POSIX, only clean up the timers allocated 1218 * by timer_create(), not the BSD setitimer() timers, and only free the 1219 * structure if none of those remain. 1220 */ 1221 void 1222 timers_free(struct proc *p, int which) 1223 { 1224 struct ptimers *pts; 1225 struct ptimer *ptn; 1226 struct timespec ts; 1227 int i; 1228 1229 if (p->p_timers == NULL) 1230 return; 1231 1232 pts = p->p_timers; 1233 mutex_spin_enter(&timer_lock); 1234 if (which == TIMERS_ALL) { 1235 p->p_timers = NULL; 1236 i = 0; 1237 } else { 1238 timespecclear(&ts); 1239 for (ptn = LIST_FIRST(&pts->pts_virtual); 1240 ptn && ptn != pts->pts_timers[ITIMER_VIRTUAL]; 1241 ptn = LIST_NEXT(ptn, pt_list)) { 1242 KASSERT(ptn->pt_type == CLOCK_VIRTUAL); 1243 timespecadd(&ts, &ptn->pt_time.it_value, &ts); 1244 } 1245 LIST_FIRST(&pts->pts_virtual) = NULL; 1246 if (ptn) { 1247 KASSERT(ptn->pt_type == CLOCK_VIRTUAL); 1248 timespecadd(&ts, &ptn->pt_time.it_value, 1249 &ptn->pt_time.it_value); 1250 LIST_INSERT_HEAD(&pts->pts_virtual, ptn, pt_list); 1251 } 1252 timespecclear(&ts); 1253 for (ptn = LIST_FIRST(&pts->pts_prof); 1254 ptn && ptn != pts->pts_timers[ITIMER_PROF]; 1255 ptn = LIST_NEXT(ptn, pt_list)) { 1256 KASSERT(ptn->pt_type == CLOCK_PROF); 1257 timespecadd(&ts, &ptn->pt_time.it_value, &ts); 1258 } 1259 LIST_FIRST(&pts->pts_prof) = NULL; 1260 if (ptn) { 1261 KASSERT(ptn->pt_type == CLOCK_PROF); 1262 timespecadd(&ts, &ptn->pt_time.it_value, 1263 &ptn->pt_time.it_value); 1264 LIST_INSERT_HEAD(&pts->pts_prof, ptn, pt_list); 1265 } 1266 i = TIMER_MIN; 1267 } 1268 for ( ; i < TIMER_MAX; i++) { 1269 if (pts->pts_timers[i] != NULL) { 1270 itimerfree(pts, i); 1271 mutex_spin_enter(&timer_lock); 1272 } 1273 } 1274 if (pts->pts_timers[0] == NULL && pts->pts_timers[1] == NULL && 1275 pts->pts_timers[2] == NULL && pts->pts_timers[3] == NULL) { 1276 p->p_timers = NULL; 1277 mutex_spin_exit(&timer_lock); 1278 pool_put(&ptimers_pool, pts); 1279 } else 1280 mutex_spin_exit(&timer_lock); 1281 } 1282 1283 static void 1284 itimerfree(struct ptimers *pts, int index) 1285 { 1286 struct ptimer *pt; 1287 1288 KASSERT(mutex_owned(&timer_lock)); 1289 1290 pt = pts->pts_timers[index]; 1291 pts->pts_timers[index] = NULL; 1292 if (!CLOCK_VIRTUAL_P(pt->pt_type)) 1293 callout_halt(&pt->pt_ch, &timer_lock); 1294 if (pt->pt_queued) 1295 TAILQ_REMOVE(&timer_queue, pt, pt_chain); 1296 mutex_spin_exit(&timer_lock); 1297 if (!CLOCK_VIRTUAL_P(pt->pt_type)) 1298 callout_destroy(&pt->pt_ch); 1299 pool_put(&ptimer_pool, pt); 1300 } 1301 1302 /* 1303 * Decrement an interval timer by a specified number 1304 * of nanoseconds, which must be less than a second, 1305 * i.e. < 1000000000. If the timer expires, then reload 1306 * it. In this case, carry over (nsec - old value) to 1307 * reduce the value reloaded into the timer so that 1308 * the timer does not drift. This routine assumes 1309 * that it is called in a context where the timers 1310 * on which it is operating cannot change in value. 1311 */ 1312 static int 1313 itimerdecr(struct ptimer *pt, int nsec) 1314 { 1315 struct itimerspec *itp; 1316 1317 KASSERT(mutex_owned(&timer_lock)); 1318 KASSERT(CLOCK_VIRTUAL_P(pt->pt_type)); 1319 1320 itp = &pt->pt_time; 1321 if (itp->it_value.tv_nsec < nsec) { 1322 if (itp->it_value.tv_sec == 0) { 1323 /* expired, and already in next interval */ 1324 nsec -= itp->it_value.tv_nsec; 1325 goto expire; 1326 } 1327 itp->it_value.tv_nsec += 1000000000; 1328 itp->it_value.tv_sec--; 1329 } 1330 itp->it_value.tv_nsec -= nsec; 1331 nsec = 0; 1332 if (timespecisset(&itp->it_value)) 1333 return (1); 1334 /* expired, exactly at end of interval */ 1335 expire: 1336 if (timespecisset(&itp->it_interval)) { 1337 itp->it_value = itp->it_interval; 1338 itp->it_value.tv_nsec -= nsec; 1339 if (itp->it_value.tv_nsec < 0) { 1340 itp->it_value.tv_nsec += 1000000000; 1341 itp->it_value.tv_sec--; 1342 } 1343 timer_settime(pt); 1344 } else 1345 itp->it_value.tv_nsec = 0; /* sec is already 0 */ 1346 return (0); 1347 } 1348 1349 static void 1350 itimerfire(struct ptimer *pt) 1351 { 1352 1353 KASSERT(mutex_owned(&timer_lock)); 1354 1355 /* 1356 * XXX Can overrun, but we don't do signal queueing yet, anyway. 1357 * XXX Relying on the clock interrupt is stupid. 1358 */ 1359 if (pt->pt_ev.sigev_notify != SIGEV_SIGNAL || pt->pt_queued) { 1360 return; 1361 } 1362 TAILQ_INSERT_TAIL(&timer_queue, pt, pt_chain); 1363 pt->pt_queued = true; 1364 softint_schedule(timer_sih); 1365 } 1366 1367 void 1368 timer_tick(lwp_t *l, bool user) 1369 { 1370 struct ptimers *pts; 1371 struct ptimer *pt; 1372 proc_t *p; 1373 1374 p = l->l_proc; 1375 if (p->p_timers == NULL) 1376 return; 1377 1378 mutex_spin_enter(&timer_lock); 1379 if ((pts = l->l_proc->p_timers) != NULL) { 1380 /* 1381 * Run current process's virtual and profile time, as needed. 1382 */ 1383 if (user && (pt = LIST_FIRST(&pts->pts_virtual)) != NULL) 1384 if (itimerdecr(pt, tick * 1000) == 0) 1385 itimerfire(pt); 1386 if ((pt = LIST_FIRST(&pts->pts_prof)) != NULL) 1387 if (itimerdecr(pt, tick * 1000) == 0) 1388 itimerfire(pt); 1389 } 1390 mutex_spin_exit(&timer_lock); 1391 } 1392 1393 static void 1394 timer_intr(void *cookie) 1395 { 1396 ksiginfo_t ksi; 1397 struct ptimer *pt; 1398 proc_t *p; 1399 1400 mutex_enter(proc_lock); 1401 mutex_spin_enter(&timer_lock); 1402 while ((pt = TAILQ_FIRST(&timer_queue)) != NULL) { 1403 TAILQ_REMOVE(&timer_queue, pt, pt_chain); 1404 KASSERT(pt->pt_queued); 1405 pt->pt_queued = false; 1406 1407 if (pt->pt_proc->p_timers == NULL) { 1408 /* Process is dying. */ 1409 continue; 1410 } 1411 p = pt->pt_proc; 1412 if (pt->pt_ev.sigev_notify != SIGEV_SIGNAL) { 1413 continue; 1414 } 1415 if (sigismember(&p->p_sigpend.sp_set, pt->pt_ev.sigev_signo)) { 1416 pt->pt_overruns++; 1417 continue; 1418 } 1419 1420 KSI_INIT(&ksi); 1421 ksi.ksi_signo = pt->pt_ev.sigev_signo; 1422 ksi.ksi_code = SI_TIMER; 1423 ksi.ksi_value = pt->pt_ev.sigev_value; 1424 pt->pt_poverruns = pt->pt_overruns; 1425 pt->pt_overruns = 0; 1426 mutex_spin_exit(&timer_lock); 1427 kpsignal(p, &ksi, NULL); 1428 mutex_spin_enter(&timer_lock); 1429 } 1430 mutex_spin_exit(&timer_lock); 1431 mutex_exit(proc_lock); 1432 } 1433 1434 /* 1435 * Check if the time will wrap if set to ts. 1436 * 1437 * ts - timespec describing the new time 1438 * delta - the delta between the current time and ts 1439 */ 1440 bool 1441 time_wraps(struct timespec *ts, struct timespec *delta) 1442 { 1443 1444 /* 1445 * Don't allow the time to be set forward so far it 1446 * will wrap and become negative, thus allowing an 1447 * attacker to bypass the next check below. The 1448 * cutoff is 1 year before rollover occurs, so even 1449 * if the attacker uses adjtime(2) to move the time 1450 * past the cutoff, it will take a very long time 1451 * to get to the wrap point. 1452 */ 1453 if ((ts->tv_sec > LLONG_MAX - 365*24*60*60) || 1454 (delta->tv_sec < 0 || delta->tv_nsec < 0)) 1455 return true; 1456 1457 return false; 1458 } 1459
Indexes created Mon Sep 29 21:09:56 GMT 2025